Method and system for preparing red mud-biochar composite catalyst and purifying tar

Abstract

The invention discloses a method and a system for preparing a red mud-biochar composite catalyst and purifying tar, a red mud raw material and a biomass raw material are mixed and dried and then are fed into a rotary furnace for carbon thermal reduction reaction to obtain the red mud-biochar composite catalyst, and the red mud-biochar composite catalyst has a special structure and catalytic activity; volatile components generated in the preparation process of the catalyst enter a downdraft gasifier and are used as a gasifying agent in the gasifier to be subjected to a pyrolysis gasification reaction with biomass raw materials, and an obtained gas product enters a fixed bed reformer to be subjected to a catalytic reforming reaction under the obtained red mud-biological coke composite catalyst after passing through a cyclone dust collector, the content of biomass gasification tar is greatly reduced, and a gas product of the catalytic reforming reaction is driven to a gas turbine through an induced draft fan and drives a power generator to generate power. Combustion tail gas serves as a heat source of the rotary furnace and the drum-type dryer. The whole system is high in energy efficiency and low in operation cost, and a catalyst preparation process and a biomass gasification tar deep purification process are effectively coupled.

Description

technical field [0001] The invention belongs to the field of composite catalyst preparation and tar purification, in particular to a method and system for the preparation of a red mud-biocoke composite catalyst and tar purification. Background technique [0002] As a new type of renewable energy, biomass energy has been widely used. Among them, biomass gasification to prepare gas is an important way of biomass energy utilization. However, tar will inevitably be produced in the gasification process. The existence of tar will not only reduce the gasification efficiency, but also condense at low temperature and affect the whole process. Stable operation of the gasification system. [0003] Catalytic cracking is an effective method to remove tar, which can not only solve the problem of the harm of tar, but also improve the calorific value of gas. Therefore, the preparation of catalysts with low cost and excellent performance has become the key to biomass gasification technolog...

AI Technical Summary

Problems solved by technology

However, if the red mud is directly used as a tar cracking catalyst, the Fe particles are in an oxidized state and the pore structure is poor, and its catalytic efficiency is low, and long-term operation in the catalytic process will lead to sintering and rapid deactivation of the metal active sites, and the stability of the catalyst is low. Poor, therefore, using biocoke as catalyst carrier to prepare composite catalyst is an effective way to solve this problem

However, the preparation process of the catalyst is generally independent. In addition to the solid product being effectively used by the catalyst during the preparation process, other products are considered as harmful by-products, which are difficult to handle and are independent of the biomass gasification process. The problem of process coupling between

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